Impulse-transmitting device



' June 15,1926. I 1,588,517 V J. G. BLESSING IMPULSE TRANSMITTING DEVICE Filed March 16. 1924 Inusnlur' John E- 515551115 any Patented June 15, 1926.

UNITED STATES PATENT OFFICE.

JOHN G. BLESSING, OF CHICAGO, ILLINOIS, ASSIGNOR, BY MESNE ASSIGNMENTS, 'IO AUTOMATIC ELECTRIC INC, OF CHICAGO, ILLINOIS, A CORPORATION OFDELAWARE.

IirruLsn-TRA sMITTme DEVICE.

Application filed March 15, 1924. Serial No. 699,423.

The present invention relates in general to impulse transmitting devices of the dial type commonly used at substations of automatic telephone systems; and the object of the invention is to produce an' improved mechanism of the above character embody: ing a number of novel features tending to increase its efliciency and simplicity, thereby enhancing its usefulness in practice.

The invention is illustrated in the accom-' Fig. 5 is an enlarged cross sectional view' of one of and 4.

Since none of the novel features in the present invention have to do with the gear train used the details of this part of the calling device have not beenshown. It may be advisable, however, to briefly point out that the calling device is provided with the usual pawl andratchet mechanism between the finger hole dial and the gear and impulse the parts shown in Figs. 2, 8,

transmitting mechanism; Furthermore, the

device is of the type in which the shaft acting as a support for the finger hole dial eX- tends beyond the rear of the device. A calling device of this general character is disclosed in Patent No. 1,279,352, issued to A. E. Keith September 17 1918.

It is a well known fact that a calling device of this character is preferably arranged to create a prolonged time interval between the transmission of the final impulse of one digit and the transmission of the first impulseof the succeeding digit. This feature is desirable in that it-permits a greater time for automatic operation of switches followeffected by impulses transmitted by the calling device. In order to accomplish the above result in the present case a very simple arrangement is employed.

ing a directive movement thereof previously Referring to Figs. 1 and 2 of thedraw ings, the dial 1 is fixed to one end of a shaft 3 and on the opposite end of this shaft is fixed a member having arms 4 and '5. A

metal pin 6 is carried by member 4 but is insulated therefrom as shown in Fig. 5.

The usual impulse and shuntsprings are mounted on a bracket 7 and are insulated therefrom in'the usual manner.

Impulse springs 8 and 9 are provided with downwardly extending ears 13 and 14,

respectively. Shunt spring 12 is provided with a pin which extends through holes in shunt springs 11 and 10, respectively. The holes in these latter springs are amplylarge' 1 and in no case does the pin 15 come into.

contact with either of these springs. The tension of spring 12 is such that it always tends to engagespring 11. This, however, is'normally prevented by the bushing 16 on impulse spring 9 engaging pin 15, thespring' 9 being normally held in thisposition by pin 6.

It will be noted that the springs ofv the above described spring assembly are'mounted with their wide surfaces at rightanglesto the baseof the calling device. This is desirable in that it permits adjustment of the springs to be more readily made, and is accomplished by providing a new and improved type of impulse cam 17 made in the form of a cup with certain parts of the wall cut away. V

The large space between the'first finger hole on the dial and the finger stop is ample to bring about one complete revolution of.

cam 17 or a suflicient distance to, ordinarily, transmit two impulses when the digit: one. is dialled. When the digit two is dialled the distance of displacement is suflicient to" cause the gear train to operate the cam one and one-half revolution or a sufficient dis tance to, ordinarily, transmit three impulses. The last half revolution is, however, rendered ineffective in a manner which will;

now be described.

In order to make clear the manner of accomplishing the above described result it will be assumed that the digit one is dialled. The operator inserts a finger in thefi'rst hole, designated 1, and rotates the dial in a forward direction. As soon as the dial is rotated a suflicient distance to ordinarily transmit one impulse if allowed to return to normal, arm 4: moves pin 6 out of engagement with ears 13 and l lflthereby permit-- ting the contacts of impulse springs 8 and 9 to be substituted for pin 6 and ears 13 and" 14;. Thesligh-t movementofimpul se-springs 8 and 9 also brings? theses springs-into ranges. of the impulse cam so that any rotation of the cam while pin 6 is disen-gaged-'fromsprings 8 and 9 will be effective. Also due. to the slight movement'of spring *9away' frompin15 springs l0, 11, and 12come-into engagement 'with Leach other .undei tension. 7 of spring .12;

At the commencement of :fotward rotahonor the dial,.arm" 5 also. movesroutof range; of governor stop 18v so: that. the earn. 1. 17a may be rotated.

As soon "as the operator has... dial until his fin ger. engages sto'p. .19,farms 4 .L and x5 are carried fstill 'Jfarther,iaway from the partst affected 'thereby.- 1 Fig. .3 .ishows. theypqsition -of'..'arms. 4 and v5 when; the dial; has beenirotated fromtthe. finger. hole. desiga nated"1?," The. operator. now removes. his; finger.- from. thesifinger. hole and...allows the 2. In an impulse transmitting device, a pair of impulse springs, a rotatable cam, means for-rotating said cam to effect interruptions of current flow through said springs by separating them, and-additional means maintaining them electrically connected, thereby rendering.anoperationof said cam ineffective;

3. In an impulse transmitting device, a

for separating said springs while rotatable-cam comprising a disk of insulatingmaterial having cam surfaces extending upward at right angles to the disk, and impulse springshavingtheir widesurfaces lye in g in planes at right angles to. saiddiskand positioned in operative relation to said-cam. o

surfaces. T

l. Iii-a calling. device, a pair of impulsesspri1igs .;;.a non-conducting cam for, momentarily separatingsald sprlngs a ,plurallty' of.

conducting ,canrfor. separating said springs to .renderlthe operation of. said first cam electrically. ineffective.

rotated. thertimeszwhen. the. device .is .operated-,Qand..-'a.g5

springs, .a non-conducting cani'for. momen- 9o tarily separating said springs a plurality. of. ;times, whenthe device. is. operated,'a condial to. return to; .normal..under control of ducting cam normally holding .said springs.

the-renal;Jpowersprhig and goyernor,.ef? apart andout of range offsaid first cam,

fe'cting the voperation ioflthe. impulse/gear... and means. for Withdrawing said second cam train.v in .the .usual.- 1nanner:' The. impulse 1 cam on. its'irfirst. half..3'1".otation iioperate's. the. 1

' impulse springs. once; :transmittihgpnm inn. 7

pulse, but. 'just prior toithe. next, last, .ha'lfii a conducting -;member. v

rotation pin6 again engages ears 13' and 14 r'normally wedged between said springs. to..100

again :short circuiting springs 8 and 9 and moving these springs out .of-ra1ige;of.tl1e im.. pulse cam, and in addition Q through the. me? dium-of bu hi g-.116 on spring 9 and pin..15,;,

hold said contact points. apart While inaintaining said "springs electrically.,connected.1.

7. Iria calling device, :a. dial rotatable f-or-..

ward and back, .iimpulse springs, a .cam ..co.-.v

again brings,- about '.the disengagement,.of-Q operating, withlsaid(springs and -Ioperated I springs ylO, lL'and, '12.. J ust. prior. vtoithen. by $119 .dialfduring bothzmovements there-v final portion of rotation .of

.cam-..1'Z.."arn1..5 of,. .andia secondmanifor directly operating,-

again moves into the. path .of-s'top l8,fthere.-. each. of: said]. springs. operated Iby, saidiby preventing i any over. rim-.101 the impulse; cam.

From theabove description .it willlbeevidialionly. during. .the return movement.there-.. of. i 8.111 a calling, device,-.a dial rotatable for-f dent that without adding; any complic'ated ward and back, a shaftsupportin g said rdial,.. mechamsms, applicant.has .devised a very a pair-of impulse springs, an .impulse cam.

simple and positive means for causinga delay at the end of/an impulse series, and. has also utilized thissame .mea-ns for .-oper-; ating a set of auvilia'ry orashunt springs.

operated .during the. return movement Ofr the dial to separate said-springsa plurality of times, and a .member fixed to said shaft and. operated thereby. to separate 'sai'd.

What is therefore considered new and. 's. .springsbefo're the return .ofthedi'al is corn. desired to have covered in Letters, Patent cpleted, I willbe brought out in the appended claims.

What is claimed is ward and back, a shaftsupporting saiddial,

1.'In1 an impulse transmitting. device of a .pair of impulsesprings, :animpulse :cam the dial type, impulse springs, a cam-for. operated duringthereturnmovementofthe operating said springs; in opposite 1 direcdiaisto separate said springs-a pluralityof tions, and means for moving .said lsprings .times, and a member fixed to saidshaft and out of range of the; cam While maintaining, operaterl thereby to separate. said springs;

them inelectrical-contact during-a .certainbefore the. return.ofvthe -dial is completed, operation of said cam, said member being of conducting material 9. 'In a calling. device, a dial rota-table forwhereby the said springs are maintained apart and out of rangehf said first cam,

electrically connected although physically and means for Withdrawing said second cam 10 separated. V during a certain operation of said first cam. 10. In a calling device, a pair of impulse In Witness whereof, I hereunto subscribe springs, a non-conducting cam for momenmy name this 12th day of March, A. D.,

tarily separating said springs a plurality of 1924.

times when the device is operated, a conducting cam normally holding said springs 7 JOHN G. BLESSING. 

